The present invention provides an underground tank having a vessel assembly and a generally spaced access assembly. That is, the access assembly includes a fuel line, a withdrawal line, and a dome assembly. The fuel line and the withdrawal line have a first end disposed outside the vessel assembly and a second end disposed adjacent to or within the vessel assembly. The first end extends upwardly from the vessel assembly toward the ground surface. The dome assembly is coupled adjacent to the fuel and withdrawal line first end. As such, the vessel assembly may be buried at any depth as the fuel and withdrawal lines may have any length.